rom the source goes through thesame motion as a point nearer, it is behind it in phase. The relation between v andt, expressed in equation (1), isvery well shown in a graph suchas the heavy curve D in figure90, where t is the abscissa and ythe ordinate. It is the same kindof curve as those shown in… … 178 LIGHT ac is the period r. Those portions of the curve that slope up-ward to the right indicate that P in figure 89 is moving up,while those that slope downward to the right indicate that P ismoving downward. The graph is drawn not only to the right ofthe origin, but also to the left,…
Light
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